the device can be configured to measure many combi-
nations of internal temperature, remote temperature,
remote voltage, remote current and internal V
CC
. The
internal 10ppm/°C reference minimizes the number of
supporting components and area required. Selectable
address and configurable functionality give the LTC2990
flexibility to be incorporated in various systems needing
temperature, voltage or current data. The LTC2990 fits
well in systems needing sub-millivolt voltage resolution,
1% current measurement and 1°C temperature accuracy
or any combination of the three.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Measures Voltage, Current and Temperature
Measures Two Remote Diode Temperatures
±1°C Accuracy, 0.06°C Resolution
±2°C Internal Temperature Sensor
14-Bit ADC Measures Voltage/Current
3V to 5.5V Supply Operating Voltage
Four Selectable Addresses
Internal 10ppm/°C Voltage Reference
10-Lead MSOP Package
applicaTions
n
n
n
n
n
Temperature Measurement
Supply Voltage Monitoring
Current Measurement
Remote Data Acquisition
Environmental Monitoring
Typical applicaTion
Voltage, Current, Temperature Monitor
2.5V
5V
V
CC
SDA
SCL
ADR0
ADR1
V1
V2
TUE (°C)
V3
LTC2990
V4
GND
T
INTERNAL
MEASURES: TWO SUPPLY VOLTAGES,
SUPPLY CURRENT, INTERNAL AND
REMOTE TEMPERATURES
–1.0
–50 –25
0
50
25
T
AMB
(°C)
75
100
125
2990 TA01a
Temperature Total Unadjusted Error
1.0
I
LOAD
0.5
T
REMOTE
R
SENSE
T
REMOTE
0
–0.5
2990 TA01b
2990f
LTC2990
absoluTe MaxiMuM raTings
Supply Voltage V
CC
................................... –0.3V to 6.0V
Input Voltages V1, V2, V3, V4, SDA, SCL,
ADR1, ADR2..................................–0.3V to (V
CC
+ 0.3V)
Operating Temperature Range
LTC2990C ................................................ 0°C to 70°C
LTC2990I .............................................–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
(Note 1)
pin conFiguraTion
TOP VIEW
V1
V2
V3
V4
GND
1
2
3
4
5
10
9
8
7
6
V
CC
ADR1
ADR0
SCL
SDA
MS PACKAGE
10-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 150°C/W
orDer inForMaTion
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC2990CMS#PBF
LTC2990CMS#TRPBF
LTDSQ
10-Lead Plastic MSOP
0°C to 70°C
LTC2990IMS#PBF
LTC2990IMS#TRPBF
LTDSQ
10-Lead Plastic MSOP
–40°C to 85°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC2990CMS
LTC2990CMS#TR
LTDSQ
10-Lead Plastic MSOP
0°C to 70°C
LTC2990IMS
LTC2990IMS#TR
LTDSQ
10-Lead Plastic MSOP
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Contact LTC Marketing for parts trimmed to ideality factors other than 1.004.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
elecTrical characTerisTics
SYMBOL
PARAMETER
General
Input Supply Range
V
CC
Input Supply Current
I
CC
Input Supply Current
I
SD
Input Supply Undervoltage Lockout
V
CC(UVL)
Measurement Accuracy
Internal Temperature Total Unadjusted
T
INT(TUE)
Error
T
RMT(TUE)
Remote Diode Temperature Total
Unadjusted Error
V
CC
Voltage Total Unadjusted Error
V
CC(TUE)
V1 Through V4 Total Unadjusted Error
V
n(TUE)
Differential Voltage Total Unadjusted Error
V
DIFF(TUE)
V1 – V2 or V3 – V4
Maximum Differential Voltage
V
DIFF(MAX)
Differential Voltage Common Mode Range
V
DIFF(CMR)
Differential Voltage LSB Weight
V
LSB(DIFF)
V
LSB(SINGLE-ENDED)
Single-Ended Voltage LSB Weight
Temperature LSB Weight
V
LSB(TEMP)
Temperature Noise
T
NOISE
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 3.3V, unless otherwise noted.
CONDITIONS
l
MIN
2.9
TYP
MAX
5.5
1.8
5
2.7
±2.5
5
5
1
±1.5
±0.25
±0.25
±0.75
300
V
CC
UNITS
V
mA
µA
V
°C
°C
°C
°C
°C
%
%
%
mV
V
µV
µV
Deg
°RMS
°/√Hz
2990f
During Conversion, I
2
C Inactive
Shutdown Mode, I
2
C Inactive
l
l
l
1.3
1.1
1
2.1
±1
1
±1
±0.5
±0.1
±0.1
±0.2
LTC2990C
LTC2990I
T
AMB
= –40°C to 25°C
T
AMB
= 25°C to 85°C
η
= 1.004 (Note 4)
2.9V ≤ V
CC
≤ 5.5V
0V ≤ V
N
≤ V
CC
, V
n
≤ 4.9V
–300mV ≤ V
D
≤ 300mV
l
l
l
l
l
l
l
l
l
l
–3
–2
–3
–300
0
19.42
305.18
0.0625
0.2
0.05
Celsius or Kelvin
Celsius or Kelvin
T
MEAS
= 46ms (Note 2)
LTC2990
elecTrical characTerisTics
SYMBOL
Res
INL
PARAMETER
Resolution (No Missing Codes)
Integral Nonlinearity
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 3.3V, unless otherwise noted.
CONDITIONS
(Note 2)
2.9V ≤ V
CC
≤ 5.5V, V
IN(CM)
= 1.5V
(Note 2)
Single-Ended
Differential
(Note 2)
0V ≤ V
N
≤ 3V (Note 2)
0V ≤ V
N
≤ V
CC
(Note 2)
(Note 2) Per Voltage, Two Minimum
(Note 2)
(Note 2)
(Note 2)
Remote Diode Mode
l
l
l
l
l
l
l
l
l
l
MIN
14
–2
–2
TYP
MAX
UNITS
Bits
LSB
LSB
pF
µA
2
2
0.35
0.6
C
IN
I
IN(AVG)
I
DC_LEAK(VIN)
Measurement Delay
Per Configured Temperature Measurement
T
INT
, T
R1
, T
R2
V1, V2, V3, V4
Single-Ended Voltage Measurement
V1 – V2, V3 – V4 Differential Voltage Measurement
V
CC
Measurement
V
CC
Max Delay
Mode[4:0] = 11101, T
INT
, T
R1
, T
R2
, V
CC
V1, V3 Output (Remote Diode Mode Only)
Output Current
I
OUT
Output Voltage
V
OUT
I
2
C Interface
ADR0, ADR1 Input Low Threshold Voltage
V
ADR(L)
ADR0, ADR1 Input High Threshold Voltage
V
ADR(H)
SDA Low Level Maximum Voltage
V
OL1
Maximum Low Level Input Voltage
V
IL
Minimum High Level Input Voltage
V
IH
SDA, SCL Input Current
I
SDAI,SCLI
Maximum ADR0, ADR1 Input Current
I
ADR(MAX)
2
C Timing (Note 2)
I
Maximum SCL Clock Frequency
f
SCL(MAX)
Minimum SCL Low Period
t
LOW
Minimum SCL High Period
t
HIGH
Minimum Bus Free Time Between Stop/
t
BUF(MIN)
Start Condition
Minimum Hold Time After (Repeated)
t
HD,STA(MIN)
Start Condition
Minimum Repeated Start Condition Set-Up
t
SU,STA(MIN)
Time
Minimum Stop Condition Set-Up Time
t
SU,STO(MIN)
Minimum Data Hold Time Input
t
HD,DATI(MIN)
Minimum Data Hold Time Output
t
HD,DATO(MIN)
Minimum Data Set-Up Time Input
t
SU,DAT(MIN)
Maximum Suppressed Spike Pulse Width
t
SP(MAX)
SCL, SDA Input Capacitance
C
X
V1 Through V4 Input Sampling
Capacitance
V1 Through V4 Input Average Sampling
Current
V1 Through V4 Input Leakage Current
–10
37
1.2
1.2
1.2
46
1.5
1.5
1.5
10
55
1.8
1.8
1.8
167
350
V
CC
0.3 • V
CC
0.4
0.3 • V
CC
±1
±1
nA
ms
ms
ms
ms
ms
µA
V
V
V
V
V
V
µA
µA
kHz
µs
ns
µs
ns
ns
ns
ns
ns
ns
ns
pF
260
0
Falling
Rising
I
O
= –3mA, V
CC
= 2.9V to 5.5V
SDA and SCL Pins
SDA and SCL Pins
0 < V
SDA
,
SCL
< V
CC
ADR0 or ADR1 Tied to V
CC
or GND
l
l
l
l
l
l
l
0.7 • V
CC
0.7 • V
CC
400
1.3
600
1.3
600
600
600
0
900
100
250
10
300
50
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
Guaranteed by design and not subject to test.
Note 3:
Integral nonlinearity is defined as the deviation of a code from a
straight line passing through the actual endpoints of the transfer curve.
The deviation is measured from the center of the quantization band.
Note 4:
Trimmed to an ideality factor of 1.004 at 25°C. Remote diode
temperature drift (TUE) verified at diode voltages corresponding to
the temperature extremes with the LTC2990 at 25°C. Remote diode
temperature drift (TUE) guaranteed by characterization over the LTC2990
能源基础设施
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